reference implementation of go app

proto/demo/app/v1alpha1/app.proto

@@ -0,0 +1,28 @@
+syntax = "proto3";
+package demo.app.v1alpha1;
+
+import "google/api/annotations.proto";
+import "google/protobuf/timestamp.proto";
+
+option go_package = "gitea.libretechconsulting.com/rmcguire/go-http-server-with-otel/api/v1alpha1/demo";
+
+// Options for random fact, in this case
+// just a language
+message GetDemoRequest {
+  optional string language = 1;
+}
+
+// Returns a randome fact, because this is a demo app
+// so what else do we do?
+message GetDemoResponse {
+  google.protobuf.Timestamp timestamp = 1;
+  string fact = 2;
+  string source = 3;
+  string language = 4;
+}
+
+service DemoAppService {
+  rpc GetDemo(GetDemoRequest) returns (GetDemoResponse) {
+    option (google.api.http) = {get: "/v1alpha1/demo"}; // grpc-gateway endpoint
+  }
+}